US5754373A - Head drum assembly having a pre-loading sheet sleeve structured to facilitate its connection with a shaft and a rotor plate and method for fixing the same onto the shaft - Google Patents

Head drum assembly having a pre-loading sheet sleeve structured to facilitate its connection with a shaft and a rotor plate and method for fixing the same onto the shaft Download PDF

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Publication number
US5754373A
US5754373A US08/594,924 US59492496A US5754373A US 5754373 A US5754373 A US 5754373A US 59492496 A US59492496 A US 59492496A US 5754373 A US5754373 A US 5754373A
Authority
US
United States
Prior art keywords
rotating shaft
rotor plate
drum assembly
head drum
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/594,924
Other languages
English (en)
Inventor
Keum-Mo Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WiniaDaewoo Co Ltd
Original Assignee
Daewoo Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daewoo Electronics Co Ltd filed Critical Daewoo Electronics Co Ltd
Assigned to DAEWOO ELECTRONICS CO., LTD. reassignment DAEWOO ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, KEUM-MO
Application granted granted Critical
Publication of US5754373A publication Critical patent/US5754373A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
    • G11B5/53—Disposition or mounting of heads on rotating support
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/60—Guiding record carrier
    • G11B15/61—Guiding record carrier on drum, e.g. drum containing rotating heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller bearings
    • F16C25/08—Ball or roller bearings self-adjusting
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/60—Guiding record carrier
    • G11B15/66—Threading; Loading; Automatic self-loading
    • G11B15/665—Threading; Loading; Automatic self-loading by extracting loop of record carrier from container
    • G11B15/6653—Threading; Loading; Automatic self-loading by extracting loop of record carrier from container to pull the record carrier against drum
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads

Definitions

  • the present invention relates to a head drum assembly for use in a video cassette recorder; and, more particularly, to a pre-loading sleeve capable of pre-loading a ball bearing installed within a head drum assembly with an increased ease, an improved reliability and at a reduced cost.
  • the illustrated head drum assembly 100 is a type including a rotating shaft 10, a rotational drum 20 equipped with a video head 21, and a flange drum 30 fixed to the rotational drum 20 into which the rotating shaft 10 is closely fitted.
  • the rotating shaft 10 is rotatably supported by a pair of ball bearings, i.e., an upper ball bearing 45 and a lower ball bearing 46, with respect to a stationary drum 40.
  • Each of the ball bearings e.g., the upper ball bearing 45
  • the upper ball bearing 45 is made of three parts, namely, an inner ring 45c, a plurality of balls 45b and an outer ring 45a, and there exists a clearance between the inner ring 45c and the balls 45b and between the balls 45b and the outer ring 45a, respectively.
  • the clearance therebetween in order for the rotating shaft 10 to rotate precisely, the clearance therebetween must be made as small as possible, and this is known as a pre-loading of the ball bearing.
  • the illustrated head drum assembly 100 employs a protuberance 31 formed on a flange 30 and a pre-loading boss 50 in pre-loading the two ball bearings 45 and 46.
  • the pre-loading boss 50 is fixed to a rotor plate 60 by a plurality of bolts 52.
  • the pre-loading boss 50 is further fixed to the rotating shaft 10 in such a manner that a plurality of set-screws 53 depress a surface of the rotating shaft 10.
  • the latter has to be made of a material having a relatively high intensity, e.g., brass which may, in turn, increase the manufacturing cost of the head drum assembly.
  • a primary object of the invention to provide a pre-loading sleeve capable of pre-loading a ball bearing installed within a head drum assembly with an increased ease, an improved reliability and at a reduce cost.
  • a head drum assembly of having an upper and a lower ball bearing, each of the ball bearings having an inner ring, a plurality of balls and an outer ring, and a rotating shaft rotatably supported through the upper and the lower ball bearings with respect to a stationary drum
  • the head drum assembly comprising: a flange fixed around the rotating shaft and including an upper abutment stopper for preventing the inner ring of the upper ball bearing from moving up with respect to the rotating shaft; and a pre-loading sleeve including a sleeve portion fixed around the rotating shaft in a press-fit relationship therewith, the sleeve portion having a lower abutment stopper for preventing the inner ring of the lower ball bearing from moving down with respect to the rotating shaft.
  • FIG. 1 shows a longitudinal sectional view of a head drum assembly employing a prior art pre-loading boss
  • FIG. 2 represents a sectional plan view of the pre-loading boss in FIG. 1;
  • FIG. 3 illustrates a longitudinal sectional view of a head drum assembly incorporated therein an inventive pre-loading sleeve in accordance with a first embodiment of the present invention
  • FIG. 4 offers a longitudinal sectional view of a head drum assembly employing therein an inventive pre-loading sleeve in accordance with a second embodiment of the present invention
  • FIG. 5 presents a bottom view of a rotor plate shown in FIG. 4.
  • FIG. 6 is a sectional view of modification of the second embodiment.
  • an inventive head drum assembly 150 is provided with rotating bodies including a rotating shaft 100, a flange 110 fixed around the rotating shaft 100 in a press-fit relationship therewith, and a rotational drum 200 fixed to the flange 110.
  • a pair of ball bearings i.e., an upper ball bearing 130 and a lower ball bearing 140, are used to rotatably support the rotating bodies 100, 110 and 200 with respect to a stationary drum 300 secured on a deck 120.
  • Each of the ball bearings e.g., 130
  • the inner rings 130a, 140a are urged toward each other, leaving the pair of ball bearings 130, 140 in "a pre-loaded condition".
  • a protuberance 111 downwardly formed from the flange 110 and a pre-loading sleeve 500 fixed around the rotating shaft 100 are used to force the pair of ball bearings 130, 140 into the pre-loaded condition.
  • the protuberance 111 of the flange 110 serves as an upper abutment stopper for preventing the inner ring 130a of the upper ball bearing 130 from moving up with respect to the rotating shaft 100.
  • the pre-loading sleeve 500 is installed within a driving motor 350 positioned around a lower part of the rotating shaft 100.
  • the pre-loading sleeve 500 is provided with a press-fit sleeve 520 having an abutment with the low inner ring 140a in order to prevent the low inner ring 140a from moving down with respect to the rotating shaft 100.
  • the pre-loading sleeve 500 is also provided with a rotor plate connection 510 extending from the press-fit sleeve 520.
  • the pre-loading sleeve 500 is normally manufactured by pressing a galvanized sheet iron into a desired shape. However, the pre-loading sleeve 500 can be also made of aluminum or plastic by using an injection molding method.
  • the rotor plate connection 510 is fixed to a rotor plate 400 of the driving motor 350 by threads 410.
  • a plurality of through-holes 400 for the thread 410 are arranged on the rotor plate 400 in a radial manner.
  • a self-tapping screw can be used as the thread 410, eliminating a number of preparatory processes, for example, drilling and tapping needed to shape a thread-hole on the rotor plate connection 510, since the latter 510 is in a sheet metal from.
  • the press-fit sleeve 520 is fixed to the rotating shaft 100 in a press-fit relationship therewith. In fixing it to the rotating shaft 100, the press-fit sleeve 520 is first heated, causing its diameter to expand, is positioned around the rotating shaft 100 and is then cooled, causing its diameter to contract to its original dimension. Because the inventive pre-loading sleeve 500 is fixed to the rotating shaft 100 in such press-fit manner, it can be fixed to the rotating shaft 100 without a set-screw or the like.
  • FIG. 4 a second embodiment 500' of the inventive pre-loading sleeve.
  • the rotor plate connection 510' is fixed to the rotor plate 400 by a pair of lugs 410' protruding through the through-holes 420.
  • the pair of lugs 410' downwardly extend from the corresponding portions of the rotor plate connection 510' to the through-holes 420.
  • Each of the lugs 410' is in at least a partial press-fit relationship with the through-hole 420.
  • a separation between the lugs 410' is made larger than that of the through-holes 420.
  • FIG. 6 a modification of the second embodiment of the inventive pre-loading sleeve is illustrated.
  • the lug 410' has a round head 430, wherein the round head 430 is shaped at a protruding portion in the lug 410' out of the through-hole 420 after the inserting operation of the lug 410' into the rotor plate 400.
  • the round head 430 has a substantially larger diameter than that of the through-hole 420. Since the second embodiment and its modification do not require the use of threads, it leads to a pre-loading sleeve having reduced components.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Motor Or Generator Frames (AREA)
US08/594,924 1995-03-29 1996-01-31 Head drum assembly having a pre-loading sheet sleeve structured to facilitate its connection with a shaft and a rotor plate and method for fixing the same onto the shaft Expired - Fee Related US5754373A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR95-5854 1995-03-29
KR2019950005854U KR0119724Y1 (ko) 1995-03-29 1995-03-29 헤드드럼 조립체

Publications (1)

Publication Number Publication Date
US5754373A true US5754373A (en) 1998-05-19

Family

ID=19410180

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/594,924 Expired - Fee Related US5754373A (en) 1995-03-29 1996-01-31 Head drum assembly having a pre-loading sheet sleeve structured to facilitate its connection with a shaft and a rotor plate and method for fixing the same onto the shaft

Country Status (4)

Country Link
US (1) US5754373A (ko)
JP (1) JPH08273131A (ko)
KR (1) KR0119724Y1 (ko)
CN (1) CN1137145A (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030024447A (ko) * 2001-09-18 2003-03-26 엘지전자 주식회사 자기기록재생기의 헤드드럼장치
US20050210103A1 (en) * 2001-12-03 2005-09-22 Microsoft Corporation Automatic detection and tracking of multiple individuals using multiple cues

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564876A (en) * 1981-11-30 1986-01-14 Victor Company Of Japan, Ltd. Rotary magnetic head device
US4959740A (en) * 1983-11-18 1990-09-25 Canon Denshi Kabushiki Kaisha Disc recording and/or reproducing apparatus including means for minimizing the effects of temperature changes
US4992900A (en) * 1988-01-21 1991-02-12 Deutsche Thomson-Brandt Gmbh Head wheel arrangement having a rotating nuts with reduced backlash for a recorder
US5486966A (en) * 1993-08-24 1996-01-23 Daewoo Electronics Co., Ltd. Head drum ground system for use in a video cassette recorder
US5504642A (en) * 1991-11-25 1996-04-02 Victor Company Of Japan, Ltd. Magnetic recording/reproducing apparatus having a locus plane of rotary heads tiltable with respect to a lower drum

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564876A (en) * 1981-11-30 1986-01-14 Victor Company Of Japan, Ltd. Rotary magnetic head device
US4959740A (en) * 1983-11-18 1990-09-25 Canon Denshi Kabushiki Kaisha Disc recording and/or reproducing apparatus including means for minimizing the effects of temperature changes
US4992900A (en) * 1988-01-21 1991-02-12 Deutsche Thomson-Brandt Gmbh Head wheel arrangement having a rotating nuts with reduced backlash for a recorder
US5504642A (en) * 1991-11-25 1996-04-02 Victor Company Of Japan, Ltd. Magnetic recording/reproducing apparatus having a locus plane of rotary heads tiltable with respect to a lower drum
US5486966A (en) * 1993-08-24 1996-01-23 Daewoo Electronics Co., Ltd. Head drum ground system for use in a video cassette recorder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030024447A (ko) * 2001-09-18 2003-03-26 엘지전자 주식회사 자기기록재생기의 헤드드럼장치
US20050210103A1 (en) * 2001-12-03 2005-09-22 Microsoft Corporation Automatic detection and tracking of multiple individuals using multiple cues

Also Published As

Publication number Publication date
JPH08273131A (ja) 1996-10-18
CN1137145A (zh) 1996-12-04
KR0119724Y1 (ko) 1998-08-01
KR960032508U (ko) 1996-10-24

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Owner name: DAEWOO ELECTRONICS CO., LTD., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KIM, KEUM-MO;REEL/FRAME:007858/0983

Effective date: 19951215

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STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

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Effective date: 20020519